code: def current_trace_id(cls):
      if not getattr(cls._locals, "trace_id", None):
          cls.set_trace_id(uuid.uuid4().hex)
      return cls._locals.trace_id
  
imports: import argparse
  import sys
  import threading
  import uuid
  import pyarrow
  import pyarrow.flight
label_desc: Use image node_id 1 for calling the TraceContext obj's underlying member method code with example usage: obj.current_trace_id(cls) and returns: cls